Indeed, that thought crossed my mind. There might not typically be a significant difference between the utility classes used above the fold compared to those used throughout the rest of the page.
Certain UI components may only be present above the fold, which makes it beneficial to include their CSS classes and IDs in a critical stylesheet when using regular CSS. However, with utility classes, it’s more ‘random’—for lack of a better term—regarding which classes are used for components above or below the fold.
This seems like a limitation inherent to a utility-first approach.
